The village of farmers successfully defeat the bandits. Out of the seven original samurai, only Kambei, Katsushiro, and Sichiroji (Takashi Shimura, Isao Kimura and Daisuke Kato, respectively) survive. The love between Katsushiro and Shino (Keiko Tsushima) ends immediately after the battle, and Kambei explains that the farmers have won, and not the samurai.
Thanks, Colin M!